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Find 22 of the same kind (letters are orthogonal connected, not diagonal).
After that, reveal the 23th one.
CSV:
,,,,,,,,,U,S,I,P,O,S,A,S,I,G,G
,,,,,,,,,H,E,L,I,R,T,H,U,E,U,E
,,,24,20,18,,,,D,G,R,U,A,M,S,U,T,D,H
,,,16,15,18,,,,E,U,R,T,U,L,F,I,U,E,G
,,,P,22,12,,,,U,U,D,P,E,R,H,S,D,D,I
,,,P,18,N,,...